[pushed] c++: #pragma target and deferred instantiation [PR115403]

[Jason Merrill]

Tested x86_64-pc-linux-gnu, applying to trunk.

Also built highway to check.

-- 8< --

My patch for 109753 applies the current #pragma target/optimize to a
function when we compile it, which was a problem for a template
instantiation deferred until EOF, where different #pragmas are active.  So
let's only do this for artificial functions.

	PR c++/115403
	PR c++/109753

gcc/cp/ChangeLog:

	* decl.cc (start_preparsed_function): Only call decl_attributes for
	artificial functions.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/pragma-target1.C: New test.
---
 gcc/cp/decl.cc                            | 7 +++++--
 gcc/testsuite/g++.dg/ext/pragma-target1.C | 6 ++++++
 2 files changed, 11 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/ext/pragma-target1.C

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 6b686d75a49..279af21eed0 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -17882,8 +17882,11 @@ start_preparsed_function (tree decl1, tree attrs, int flags)
 	doing_friend = true;
     }
 
-  /* Adjust for #pragma target/optimize.  */
-  decl_attributes (&decl1, NULL_TREE, 0);
+  /* Adjust for #pragma target/optimize if this is an artificial function that
+     (probably) didn't go through grokfndecl.  We particularly don't want this
+     for deferred instantiations, which should match their template.  */
+  if (DECL_ARTIFICIAL (decl1))
+    decl_attributes (&decl1, NULL_TREE, 0);
 
   if (DECL_DECLARED_INLINE_P (decl1)
       && lookup_attribute ("noinline", attrs))
diff --git a/gcc/testsuite/g++.dg/ext/pragma-target1.C b/gcc/testsuite/g++.dg/ext/pragma-target1.C
new file mode 100644
index 00000000000..0ce2438da2f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/pragma-target1.C
@@ -0,0 +1,6 @@
+// PR c++/115403
+// { dg-do compile { target x86_64-*-* } }
+
+template <typename> __attribute__((always_inline)) inline void AssertEqual() {}
+void TestAllF16FromF32() { AssertEqual<float>(); }
+#pragma GCC target "sse4.1"

base-commit: 29341f21ce1eb7cdb8cd468e4ceb0d07cf2775e0
-- 
2.45.2